构造函数原型实例化问题

function Person(name,age){
console.log(this)
this.names=name;
this.age=age;
Person.prototype.say=function(){
return this.names+"是xx";
};
this.xx=function(){
return this.names+"是xx";
};

}

var b=new Person("a",12)
var c=new Person()
console.log(b.say==c.say)
console.log(b.xx==c.xx)

 

 

+++++++++++++++++++++++++++++++++++++++++++++++

function Person(){

// Person.prototype.names=["123","456"];

}
Person.prototype.names=["123","456"];
Person.prototype={
age:12,
word:"12",
}
var b=new Person()
console.log(b.names)

console.log(b.names)
var c=new Person()
console.log(c.names)
c.names.push("789")
console.log(b.constructor)
console.log(c.names)

 

 

function Person(){

Person.prototype.names=["123","456"];

}
// Person.prototype.names=["123","456"];
//原型不要写入构造函数内，否则会被实例化；
Person.prototype={
age:12,
word:"12",
names:["a","b","c"],
}
var c=new Person()
var b=new Person()
console.log(b.names)

console.log(b.names)
console.log(c.names)
c.names.push("789")
console.log(b.constructor)
console.log(c.names)